4y^2-x^2/x^2÷x-2y/2x^2 2xy
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4y^2-x^2/x^2÷x-2y/2x^2 2xy
4y^2-x^2/x^2÷x-2y/2x^2 2xy
4y^2-x^2/x^2÷x-2y/2x^2 2xy
最后一个是什么符号?